I've been reading an old copy of "Programming Python"
and started to work on one of its challenges. I have
a text file called table.txt:
1 5 10 2 1.0
2 10 20 4 2.0 3
3 15 30 8 3 2 1
4 20 40 16 4.0
I want to add each column of numbers, so the end
result would be a list like so:
[10, 50, 100, 30 , 10.0, 5, 1]
So far, I've been able to modify some code I found in
the book:
#!/usr/bin/python
import string
def summer(fileName):
for lines_in_file in open(fileName, 'r').readlines():
cols_in_file = string.split(lines_in_file)
#print cols_in_file
numCols = len(cols_in_file)
sums = [0] * numCols
#print sums
cols = string.split(lines_in_file)
#print cols
for i in range(numCols):
sums[i] = sums[i] + eval(cols[i])
return sums
if __name__ == '__main__':
import sys
print summer(sys.argv[1])
Unfortunately, the output is:
[4, 20, 40, 16, 4.0]
The code can read the file, but the code doesn't sum
the numbers to produce a new list. Any hints?
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